AD9775-EB Analog Devices, Inc., AD9775-EB Datasheet - Page 40

• Manufacturer Part Number: AD9775-EB
• Description: 14-bit, 160 Msps, 2?/4?/8? Interpolating Dual Txdac+ Digital-to-analog Converter
• Manufacturer: Analog Devices, Inc.

AD9775
–100
–100
–100
–20
–40
–60
–80
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
–2.0
–8.0
–4.0
D
D A
Figure 85. 8× Interpolation, Complex f
Figure 86. 2× Interpolation, Complex f
Figure 87. 4× Interpolation, Complex f
D
–1.5
–6.0
–3.0
A
A
–1.0
–4.0
–2.0
B
–2.0
B
–0.5
–1.0
B
f
f
f
OUT
OUT
OUT
C
(LO)
C D
(LO)
C D
(LO)
(×
(×
(×
0
0
0
f
f
f
DATA
DATA
DATA
D
)
)
)
A
0.5
2.0
1.0
A
A
DAC
DAC
DAC
1.0
4.0
2.0
/4 Modulation
/8 Modulation
/8 Modulation
B
B
1.5
6.0
3.0
B
C
C
C
2.0
8.0
4.0
Rev. E | Page 40 of 56
Figure 89. AD9775 Real DAC Output of Complex Input Signal Near Baseband
(Positive Frequencies Only), Interpolation = 4×, No Modulation in AD9775
–100
–20
–40
–60
–80
–100
–100
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
–8.0
0
0
750
0
D A
Now Quadrature Modulated by AD8345 (LO = 800 MHz)
Figure 88. 8× Interpolation, Complex f
Figure 90. AD9775 Complex Output from Figure 89,
–6.0
760
770
10
–4.0
780
–2.0
FREQUENCY (MHz)
FREQUENCY (MHz)
f
790
OUT
B C
20
(LO)
(×
0
800
f
DATA
D A
)
810
2.0
30
820
DAC
4.0
/8 Modulation
830
40
6.0
840
B C
8.0
850
50